Secondary-battery plate and process of manufacturing same.



UNITED STATES PATENT OFFICE.

PEDRO G. SALOM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE ELECTRICAL LEAD REDUCTION COMPANY, OF SAME PLACE AND DOVER, DELAIVARE.

SECONDARY-BATTERY PLATE AND PROCESS OF MANUFACTURING SAME.

SPECIFICATION forming part of Letters Patent No. 647,426, dated April 10, 1900.

Application filed November 1,1898. $erial No. 695,225. (No model.)

To all whom it may concern.- the material used need not be compressed to Be it known that I, PEDRO G. SALOM, a citisuch a degree; but it will be understood that zen of the United States, residing in Philawhile I prefer to manufacture the plates as delphia, Pennsylvania, have invented certain above I do not limit myself to any particu- Improvements in Secondary-Battery Plates lar degree of pressure, the object being to and Processes of Manufacturing Same, of compress the entire mass of spongy lead to which the following is a specification. such a degree that it will act as a secondary- The object of myinvention is to provide in a battery plate and have sufficient coherence simple and cheaper manner than usual a plate to withstand ordinary usage.

IQ for secondary batteries, my improved plate The terminal may either form an integral 6o occupying a position between an ordinary part of the plate or maybe soldered or other- Plant plate of solid lead and the Brushwise secured thereto.

Faure plate, consisting of active material or It will beunderstood that in manufacturing material to become active applied to a grid or a plate according to my invention the surface I5 support of solid lead. of the plate may be either plain or of any de- In carrying out myinvention I take a mass sired configuration in order to increase the of spongy lead produced in any available active surface.

manner and subject the same to such pres- Having thus described my invention, 1 sure in a suitable mold that the particles of claim and desire to secure by Letters Pat- :0 spongy lead will be caused to cohere, the mass ent while lackingthe density of a cast-lead plate 1. The mode herein described of making a being so coherent or homogeneous that it will secondary-battery plate without the use of not be disintegrated by handling or by the a support-plate, said mode consisting in comelectrochemical action known as forming pressing a mass of spongy lead sufiiciently to 25 the plate. When a plate of this character is form a coherent homogeneous mass and arsubjected to the action of an electric current resting the application of pressure before the while contained in a suitable electrolyte, it mass assumes the density of a cast-lead plate, can be much more readily oxidized than the substantially as described. usual solid lead Plant plate, owing to its 2. The within-described secondary-battery 5o lesser density, and as the plate consists plate consisting of spongy lead compressed throughout of a coherent homogeneous mass into a coherent homogeneous mass of less it is not as liable to disintegration as a plate density than cast-lead, and constituting an consisting of a lead grid or support having electrode without separate support-plate,sub-

' active material or material to become active stantially as described.

5 applied. thereto in the form of paste or ce- 3. The mode herein described of making a ment. Moreover, owing to the low cost of secondary-battery plate without the use of spongy lead as compared with solid cast-lead a support-plate, said mode consisting in placor lead oxid, my improved plate is much ing a layer of spongy lead Within a mold and I cheaper than any secondary-battery plate then uniformly compressing the entire mass l 0 heretofore produced and of which I have so as to form a coherent homogeneous secknowledge. ondary battery plate, substantially as de- In the manufacture of the plates above menscribed. tioned Iprefer to regulate the amount of pres- In testimony whereof I have signed my sure, and consequently the relative density of name to this specification in the presence of 45 the mass, according to the fuse to which the two subscribing witnesses.

plate is to be applied. It, or instance, the plate is to be subjected to high rates of dis- PEDRO SALON charge, it is manifestly better to have the Witnesses: plate dense, and, on the other hand, if the WILL. A. BARR, 50 plate is subjected to low rates of discharge Jos. ll. KLEIN. 

